Drilling and bolting a sign into a listed building

[tigwig]

Is this legal? I live in the grounds of an old converted hospital which still has the original clocktower which is listed. Ajoining the clocktower is a car park which belongs to a a newly converted church. The owners of the church have decided to block off this car park for their use only which is fair enough but when doing this they have put the fence posts all on the exterior part of their land which doesn't belong to them and half of it belongs to the NHS. Can they do this? They also drilled a no parking sign into the clocktower which looked terrible and somebody obviously thought the same because they ripped it out! Now it is left with 2 ugly big bolts hanging out of it. The reason this is bothering me is because on weekends they cause havoc with parking on the street making it very difficult for emergency vehicles to get through and people often block our drive (which is ajoining their land) and stop people parking outside their houses and leave them no where else to park. Then they have the cheek to block off a car park which they do not use half of the time and was only used by 1 or 2 residents trying to keep their cars off the street.

[Richard1966]

if its listed you need permission to cough near it let alone do any work on it. Dont touch until you speak to the council and if emergency veichles are effected talk to them so pressure can be put from all concerned.